Have you first checked if any PID's are still running? Looking at the screenshots I get the idea your system still has processes running in the background (especially on the last message). As this is not Production or is it live, you can run "HDB kill" on the OS to make sure everything is down before trying again.
The lock files was based on your earlier screenshot where it had an ID mismatch. They are generally found in /sapmnt/<SID>/HDB<Instance#>/<host>/lock